INTERNATIONAL
STANDARD
ISO
8601:2000(E)
©
ISO
2000
All
rights
reserved
1
Data
elements
and
interchange
formats
-
Information
interchange
-
Representation
of
dates
and
times
1
Scope
This
International
Standard
specifies
the
representation
of
dates
in
the
Gregorian
calendar
and
times
and
representations
of
periods
of
time.
It
includes
a)
calendar
dates
expressed
in
terms
of
year,
month
and
day
of
the
month;
b)
ordinal
dates
expressed
in
terms
of
year
and
day
of
the
year;
c)
week
dates
expressed
in
terms
of
year,
week
number
and
day
of
the
week;
d)
time
of
the
day
based
upon
the
24-hour
timekeeping
system;
e)
differences
between
local
time
and
Coordinated
Universal
Time
(UTC);
f)
combination
of
date
and
time;
g)
time-intervals;
h)
recurring
time-intervals.
This
International
Standard
is
applicable
whenever
dates
and
times
are
included
in
information
interchange.
This
International
Standard
does
not
cover
dates
and
times
where
words
are
used
in
the
representation
and
dates
and
times
where
characters
are
not
used
in
the
representation.
This
International
Standard
considers
the
leap
seconds
that
are
occasionally
inserted
at
the
end
of
a
calendar
month
to
maintain
astronomic
precision
of
the
calendar
day.
This
International
Standard
does
not
assign
any
particular
meaning
or
interpretation
to
any
data
element
that
uses
representations
in
accordance
with
this
International
Standard.
Such
meaning
will
be
determined
by
the
context
of
the
application.
2
Normative
references
The
following
normative
documents
contain
provisions
which,
through
reference
in
this
text,
constitute
provisions
of
this
International
Standard.
For
dated
references,
subsequent
amendments
to,
or
revisions
of,
any
of
these
publications
do
not
apply.
However,
parties
to
agreements
based
on
this
International
Standard
are
encouraged
to
investigate
the
possibility
of
applying
the
most
recent
editions
of
the
normative
documents
indicated
below.
For
undated
references,
the
latest
edition
of
the
normative
document
referred
to
applies.
Members
of
ISO
and
IEC
maintain
registers
of
currently
valid
International
Standards.
ISO
31-0:1992,
Quantities
and
units
-
Part
0:
General
principles
.
ISO
31-1:1992,
Quantities
and
units
-
Part
1:
Space
and
time
.
